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this post was submitted on 29 Jun 2024
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Uhhh, no. That’s not how RCV works at all.
Let’s say there are five candidates - A, B , C, D, and E.
Let’s assume candidates A & B are the most popular.
Personally I choose to rank them as C, E, D, B and then A.
Out of all of them, no one gets over 50% of the #1 vote. Whoever gets the lowest #1 vote is knocked out first. Let’s suggest that this is C. All of their #1 votes and therefore my vote is then transferred to E.
Let’s suggest that after this there’s still no one who has over 50% of the vote between the other four candidates. Let’s further assume that candidate E has the lowest resulting vote after the first round of knockout. My vote is then transferred to candidate D.
Out of A, B, and D, let’s assume none of them still have over 50% of the vote after this redistribution. Let’s further assume that D has the lowest vote of the three. My vote is then transferred to B.
Given there are only two candidates left, one will have to have a majority. That candidate wins.
Under RCV, as long as you mark every box with a preference your vote can never ever be wasted. It will always end up with a candidate that wins or one that loses, but it cannot ever be exhausted and therefore meaningless.
Thank you for providing an example.
Let's say E is everyone's second choice, but nobody's first choice. E is the first candidate eliminated because E got 0% of the vote.
Let's say it shakes out like this:
40% A E C B
21% B E A C
20% D E C B
19% C E D B <- You
40 A D 39 D B 21 B D
60 D 40 A
First round, E is eliminated despite being the most popular candidate by far.
Second Round, C, followed by B. D wins.
But if 3% of A voters switched to C, then A would have won because D would be eliminated, sending their votes to C, which would have eliminated B, sending those votes to A. But D and C voters hate A, so it's in their best interest to also vote for B. And now we're back to fptp
When considering the quality of a voting system, you want voters to be honest (i.e. not strategic in their votes). Voters should pick the candidate they agree with, not the candidates they think they must support to avoid a catastrophe.
Read more here.